* Any car at any time for the rest of your life. You can have one at a time, but switch at any time. The car is yours and you can do whatever you want with it

OR

* Any girl at any time for the rest of your life. You can have one at a time, but switch for a new one at any time. The girl is yours and you can do whatever you want with it. (lol, for lack of better words).

Neither can be used for financial gain. Merely for the pleasure of experience.

EDIT- you can still have the other thing.. one is just handed to you free of work and the other must be worked for as usual.